1. General part

In this part you can specify search terms by entering them in the
search fields. For every line you can select an index and give search
terms. You can combine the lines with booleaan operators.

You can also specify if the results will be sorted on relevance or year
of publication. It is also possible to specify the year of publication.
For example: 1948-1980 for publications published between 1948 and 1980,
1976- for publications published between 1976 and now and 1978, 1980, 1983
for publication published in 1978, 1980 and 1983.

Last in the general part is the choise of language.

2. Material selection

In this part you can select or not select materials. In the upperright you
select all or none.